Getting a Uputronics GPS Hat to work with Chrony?
|
Greg Engle
Anybody successful in getting this working to update the Pi clock?
Lots of information to set this up as a time server but I'm looking for a stand alone GPS for location and time for remote operation on WSJT-X. It will show up with xgps, gpsmon and cgps -s But I can't get it to update the clock in the PI Ideas Greg NZ6E
|
|
|
|
Hi Greg,
I've written a tutorial that might help. Lots of people have used it successfully. Chrony with Uputronics GPS Regards, Mike - G4WNC
|
|
|
|
The most accurate time, using Pulse Per Second or PPS, will use a GPS with PPS. This is not something you achieve with a USB GPS. The NW Digital Radio DRAWS™ HAT or Adafruit Ultimate GPS HAT are two examples of GPIO attached GPS with PPS.
On Mon, Oct 12, 2020 at 9:40 AM MIKE RICHARDS <mike@...> wrote: Hi Greg, --
John D. Hays Kingston, WA K7VE
|
|
|
|
Greg Engle
Mark,
I used your page for a puck GPS and it worked well once I figured out I had to use /dev/serial/serial-by-id to identify it.
All the tools used to make sure it works, work but it’s not updating the time.
Greg NZ6E
From: RaspberryPi-4-HamRadio@groups.io <RaspberryPi-4-HamRadio@groups.io> On Behalf Of MIKE RICHARDS
Sent: Monday, October 12, 2020 9:38 AM To: RaspberryPi-4-HamRadio@groups.io Subject: Re: [RaspberryPi-4-HamRadio] Getting a Uputronics GPS Hat to work with Chrony?
[Edited Message Follows] Hi Greg,
|
|
|
|
Greg Engle
I should have added:
Without a network connection chronyc sources -v Has the PPS0 and NEMA listed but with a ? and not recognized
From: RaspberryPi-4-HamRadio@groups.io <RaspberryPi-4-HamRadio@groups.io> On Behalf Of MIKE RICHARDS
Sent: Monday, October 12, 2020 9:38 AM To: RaspberryPi-4-HamRadio@groups.io Subject: Re: [RaspberryPi-4-HamRadio] Getting a Uputronics GPS Hat to work with Chrony?
[Edited Message Follows] Hi Greg,
|
|
|
|
David Ranch
Hello John, From the table included in https://gpsd.gitlab.io/gpsd/gpsd-time-service-howto.html#_1pps_quality_issues , the bottom summary says that accuracy delta would only be say 100mS of a time delta. I don't see how that could be a problem for 99.9% of most HAM use cases. Maybe I'm missing something here? --David KI6ZHD
On 10/12/2020 09:47 AM, John D Hays -
K7VE wrote:
|
|
|
|
Some just like a bit more precision -- here is a Raspberry Pi + Adafruit HAT chronyc sources -v 210 Number of sources = 6 .-- Source mode '^' = server, '=' = peer, '#' = local clock. / .- Source state '*' = current synced, '+' = combined , '-' = not combined, | / '?' = unreachable, 'x' = time may be in error, '~' = time too variable. || .- xxxx [ yyyy ] +/- zzzz || Reachability register (octal) -. | xxxx = adjusted offset, || Log2(Polling interval) --. | | yyyy = measured offset, || \ | | zzzz = estimated error. || | | \ MS Name/IP address Stratum Poll Reach LastRx Last sample =============================================================================== #- GPS 0 3 377 10 +28ms[ +28ms] +/- 111ms #* PPS 0 3 377 10 -193ns[ -65ns] +/- 205ns ^- 2001:49f0:d04c:1::2 2 9 377 490 -5846us[-5851us] +/- 41ms ^- 2001:470:e439:1::10 2 10 377 603 +706us[ +699us] +/- 54ms ^- x.ns.gin.ntt.net 2 10 377 605 -5024us[-5032us] +/- 38ms ^- srcf-ntp.stanford.edu 2 10 377 928 -11ms[ -11ms] +/- 56ms
On Mon, Oct 12, 2020 at 11:50 AM David Ranch <rpi4hamradio-groupsio@...> wrote:
--
John D. Hays Kingston, WA K7VE
|
|
|
|
Jason A. Powell <jason.powell.us@...>
There's a mailing list for everyone: I'll admit to being a bit obsessed with precise time myself. I recently built a Stratum-1 NTP server using the Adafruit Ultimate GPS hat: https://www.adafruit.com/product/2324. Why? Because I could! :) Jason KD8FMR
On Mon, Oct 12, 2020 at 3:14 PM John D Hays - K7VE <john@...> wrote:
|
|
|
|
Greg Engle
Ok, how did you get there?
Mine is showing a ? in the source state.
From: RaspberryPi-4-HamRadio@groups.io <RaspberryPi-4-HamRadio@groups.io> On Behalf Of John D Hays - K7VE
Sent: Monday, October 12, 2020 12:11 PM To: RaspberryPi-4-HamRadio@groups.io Subject: Re: [RaspberryPi-4-HamRadio] Getting a Uputronics GPS Hat to work with Chrony?
Some just like a bit more precision -- here is a Raspberry Pi + Adafruit HAT
On Mon, Oct 12, 2020 at 11:50 AM David Ranch <rpi4hamradio-groupsio@...> wrote:
-- John D. Hays K7VE
|
|
|
|
This is using an Adafruit Ultimate GPS Hat (similar for the DRAWS™) Added to /boot/config.txt (again specific to the Adafruit Ultimate GPS Hat): dtoverlay=pps-gpio,gpiopin=4 cat /etc/chrony/chrony.conf # Welcome to the chrony configuration file. See chrony.conf(5) for more # information about usuable directives. refclock SHM 0 refid GPS precision 1e-3 offset 0.5 delay 0.2 poll 3 trust require refclock SHM 2 refid PPS precision 1e-9 poll 3 trust pool 2.debian.pool.ntp.org iburst # This directive specify the location of the file containing ID/key pairs for # NTP authentication. keyfile /etc/chrony/chrony.keys # This directive specify the file into which chronyd will store the rate # information. driftfile /var/lib/chrony/chrony.drift # Uncomment the following line to turn logging on. #log tracking measurements statistics # Log files location. logdir /var/log/chrony # Stop bad estimates upsetting machine clock. maxupdateskew 100.0 # This directive enables kernel synchronisation (every 11 minutes) of the # real-time clock. Note that it can’t be used along with the 'rtcfile' directive. rtcsync # Step the system clock instead of slewing it if the adjustment is larger than # one second, but only in the first three clock updates. makestep 1 3 Add broadcast and allow stanzas as needed.
On Mon, Oct 12, 2020 at 1:54 PM Greg Engle <gfe@...> wrote:
--
John D. Hays Kingston, WA K7VE
|
|
|